Electromagnetic selective device.



s. BURNETT. ELECTROMAGNETIC SELECTIVE DEVICE. APPLICATION FILED SEPTJZ, 1913.

1,120,997, Patented Dec. 15, 1914.

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ELECTROMAGNETIC SELECTIVE DEVICE.

APPLICATION FILED SEPT.12, 1913;

THE NORRIS PETERS co.. FHOTOVLITHCL. WASHING mN. D (Tv Patented Dec. 15, 1914.

W. S. BURNETT.

ELECTROMAGNETIC SELECTIVE DEVICE. APPLICATION FILED SEPT.12, 1913.

Patented Dec. 15, 1914.

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W. s. BURNETT. V ELECTROMAGNETIC SELECTIVE DEVICE.

APPLICATION FILED SEPT.12, 1913.

Patented Dec. 15, 1914.

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HE NORR PL LR u.,rn-,v-..|u1u., WASHINGTON, D. C.

W. S. BURNETT. ELECTROMAGNETIC SELECTIVE DEVICE. APPLICATION FILED SEPTJZ, 1913.

1,1 20,997. Patented Dec. 15, 1914.

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THE NORRIS PETERS 60.. PHOm-LITHO., WASHINGTON, D.

UNITED srarrns PATENT onnron.

WILLIAIVI S. BURNETT, OF MILNVAUKEE, WISCONSIN, ASSIGNOB TO IEORSE CODE SIGNAL COMPANY, OF MILWAUKEE, WISCONSIN.

ELECTROMAGNETIC SELECTIVE nnvron.

Specification of Letters Patent. Patented Dec. 15, 1914.

Original application filed. August 23, 1909, Serial No. 514,131. Divided and this application filed September 12, 1913. Serial No. 789,519.

17 0 all whom it may concern Be it known that I, WILLIAM S. BURNETT, a citizenof the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Electromagnetic Selective Devices, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to improvements in electro-magnetic selective devices.

The object of my invention is to provide means for operating controlling mechanisms at any one of a series of stations along a single line of electrical conduction to the exclusion of the others, said controlling mechanism being employed for any desired purpose, such for example, as the operation of signal unlocking or lockin mechanism.

My application herein is a divisional application of my. application Serial No. 514,131, filed August 23, 1909.

In the following description, reference is had to the accompanying drawings, in which v Figure 1 is a side elevation of the apparatus used at a local or controlled stat-ion; Fig. 2 is a rear elevation of the same, show ing the parts as they appear at an unselected station during a signal unlocking operation at a selected station; Fig. 3 is a detail view of a detached portion of the mechanism shown in Fig. 2, showing the parts in normal position; Fig. 4 is a similar view showing the parts in station selecting position, preparatory to the unlocking operation; Fig. 5 is a detail side view of the selecting magnet, armatures with their supporting connections, signaling apparatus, and the selecting wheel and its pawl and ratchet actuator; Fig. 6 is a plan view of the same, showing also the selecting magnets; Fig. 7 is a detail rear view of the unlocking shoe, showing the guard finger in cross section; Fig. 8 is a front view of the same; Fig. 9 is a diagrammatic view of a series of instruments connected at different stations with a single line of conduction, and Fig. 10 is a sectional view on line aa of Fig. 5.

Like parts are identified by-the same reference characters throughout the several views.

The general features of the apparatus described and claimed herein are shown and described, but not claimed, in my former application filed April 12, 1909, Serial No. 489,319, in which application, however, electro-magnets of different structure are disclosed from those illustrated in connection with this application and the working parts of the apparatus herein illustrated are somewhat different in structure, although operating on the same general principle as the parts disclosed in said previous application.

In the drawings of this application, an ordinary electro-magnet 1, having two sets of coils, as shown, is employed as a selecting magnet. This magnet is provided with two vibrating armatures 3 and 5 respectively, the armature 3 being centrally pivoted upon a supporting rod 7 which is mounted in suitable frame bearings at 8 and 9. The armature 5 is rigidly connected with this rod 7 and a bell clapper arm 11 is rigidly connected to thisarmature 5 and provided with a clapper weight 13, whereby a vibration of armature 5 will cause the bell to sound.

The armature 3 is employed to actuate a selecting wheel 15 through an arm 17 rigidly connected with a hub 18 on said armature and through the pawls 19, ratchet member 20 and shaft 21. The ratchet member 20 and selecting wheel 15 are both rigidly connected with the shaft 21. An alternating current being employed its reversal in polarity causes the armature 3 to vibrate. This vibratory movement is utilized to actuate the ratchet 20 and the selecting Wheel 15 which will be more clear from an inspection of Fig. 5. The selecting wheel is provided ,with one or more notches 22, which, when the wheel is in selective position, will permit of an unlocking operation for releasing the bell clapper arm 11 as hereinafter described.

A resilient locking arm 27 is provided with a projection 29 adapted to normally engage an arm 30, which is rigidly connected with the rod 7, thereby preventing the rod 7 and armature 5 from vibrating and thus locking the arm 11 and bell clapper 13 against signaling movement. The resilient arm 27 is provided with a segmentally curved lip 33. This lip 33 is provided with an angularly disposed hook-shaped end portion, the'shank 34: of which is bent rearwardly, forming an angularly disposed shoe at 35, with the extremity 36 extending upwardly and forwardly in the rear of the lip, as best shown in Fig. 7 A guard finger 38 extends downwardly beyond the hook and then rearwardly and upwardly as best shown in Figs. 1 and 2.

A bell unlocking electro-m'agnet at has pole pieces 4-1 extended, and an armature 42 is pivoted at 13 between the pole pieces,

one end of the armature being heavier than the other, whereby it normally assumes an angular position, as shown in Fig. 3, but may be swung to a horizontal position by the magnetic pull ofsaidpole pieces, when the magnet is energized.

The reversals of the magnetism through the pole pieces 41' do not cause a vibration of armature 4:2 as any sufiicient magnetism will cause the armature to aline itself with the pole pieces, the interval oftime, if there be any, between the pulsations used for setting purposes not being long enough to permit retraction of this armature between pulsations or impulses. This armature carries an arm 45, which extends radially from its pivotal axis and is provided with a projection 47 adapted to enter the notch 22 in the selecting wheel 15, or to bear upon the periphery and limit the swinging movement of the armature when not in registry with the notch. Another arm isalso axially connected with the armature and carries astop 51, which, when the armature is actuated'by the magnet 40, moves to a position in the path of one or more arms 53, which extend radially from the ratchet actuated rod 21, whereby the rotary movement of this rod and selecting wheel 15 is limited When ever the magnet 40 is energized. The arm 50 carries a finger 55, preferably mounted upon a branch 56 of the arm, and hinged thereto in such a manner as to allow a limited horizontally swinging movement, the finger being swung in a vertical plane by the arm 50 and in an arc having the armature axis as a center. When so swung, the finger travelsalong the rear surface of the lip 33 into and out of proximity to the shoe 35, and when the projection e7 enters a notch 22 in the selecting wheel, the right hand or heavier end of the armature swings downwardly to such an extent as to carry the finger over the shoe 35 to a point between it and the guard finger 38, as shown in Fig. 4:, the finger contacting with and pushing the shoe forwardly, (inwardly toward the magnet) in passing to such position.

Assoon as the finger passes the shoe, the latter springs rearwardly across the path of the finger so that the finger will engage the front surface of the shoe during its next upward movement. When the magnet 40 is again energized, it swings finger 55 up wardly, and it then engages the front surgage the latch projection 29 from the arm 30,.thus unlocking the bell clapper and permitting an oscillation of armature 5, rod 7 andclapper rod 11. The bell will then continue to sound while the alternating current is maintained. lVhen the magnet 10 is again denergized by interrupting the circuit or by a cessation in current production, the gravity tilting movement of the armature 42 will swing finger 55 downwardly. But during the bell clapper releasing movement', it moved past and above the hook extremity 36 pushing the latter rearwardly in passing. The part 36, by its resilient reaction, then extends across the path of finger 55, and as this finger movesdownwardly it is guided through the opening to normal position in the rear of shoe 35, as shown in Fig. 3. This leaves the arm 27 again free to swing forwardly to normal locking positionwith projection 27 in engagement with arm 30, as shown in Fig. 1. It will there fore be'understood that the extreme tilting movement of the armature s2 at a selected station causes finger 55 to first force its way downwardly across the rear face of the angular-1y disposed shoe and then pass up wardly in front of. it-to push the lip backwardly and release the bell when the current is resumed. Also that during the upward clapper releasing movement, the finger forces its way past the hook extremity 36. the function of which is to guide the finger 55 through to the rear side of the shoe when the current again ceases.

In Fig. 9, I have illustrated a series of stations B, C, D, connected in series with one central station provided with apparatus, such as an alternating current generator or magneto A for producing and reversing the current. Each of the stations is provided with a selecting wheel 15, the various selecting wheels 15 at the different stations being provided at different angular positions with notches22 corresponding respectively to the different stations. To operate the selecting Wheels at thevariousstations, a current will be set up in the conductor. Armature 3 will then be vibrated to actuate the selective wheel 15 at each station, until the wheel at the desired station reaches a position where projection 47 may register with and enter the notch 22 in such wheel. If the current then ceases, armature 12 will tilt by gravity, and as the projection 17 then enters notch 22in the selecting wheel at the station to be called, the finger 55 at that'stati on will move past the-margin shoe 35 and assume a position below and alittle to the front of the shoe margin, as shown in Fig. 4:- Under this condition the contact arm 60 insulated from and carried by the projection 47 will close the local circuit, including the battery 61, to operate the local signal. This local circuit may be opened or closed as often as may be desired merely by making or breaking the circuit at the central office so as to cause intermittent operation of the local signal if desired after the station has once been selected. The current being then restored, armature 42 will be swung by magnet 40 to carry finger along the front face of the shoe and hook extremity 36 to the front face of the lip 33, crowding the latter to the rear and unlocking the bell clapper by withdrawing projection 29 from arm 30, after which, armature 5 is permitted to vibrate and sound the bell. In the meantime, all the ratchet actuators will be in operation to cause the selecting wheels to step around to a position where the stops 51 will engage arms 53, thus establishing a zero point from which all the selecting wheels will start in a subsequent operation. When the current again ceases to flow through the line, the armature L2 at the selected station will again move to tilted position carrying the finger 55 through the gap between hook extremity 86 and lip 33 to normal position in the rear of shoe 85. The selecting wheel having moved to Zero position, the projection 47 cannot enter the notch therein, and the finger 55 will therefore not move over the margin of the shoe as it did when the station was selected. At all the other stations, the movement of their armatures 42 will merely cause the fingers 55 to vibrate in the rear of the shoe and lip 33 since the down tilting movement of the armatures is not sufficient to carry these fingers over the margin of the shoes.

While I have shown and described the rocking armature as used to operate the un locking mechanism of a bell sounder, it will be understood that this armature movement may be utilized to perform any desired operation, such for example, as closing an electrical switch controlling local electrical mechanism, either in addition to the unlocking operation above described or independently thereof. Such a switch is illustrated at in Fig. 9, as used for controlling circuit of a local battery 61, which may thus be operated for any desired purpose.

Having however thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A signaling system having a central station and substations, united by a line circuit, a step-by-step element at each substation, a circuit changing element under the control thereof, and means including a winding and a plurality of independent magnetic circuits therefor controlled at the cen tral station to set said step-by-step element and to independently operate said circuit changing element, said means including mechanism selectively responsive to currents of opposite polarity for selectively setting said step-by-step element.

2. A signaling system having a central station and substations united by a line circuit, a step-by-step element at each substation, a circuit changing element under the control thereof, and means including a winding and a plurality of independent magnetic circuits therefor controlled at the central station to set said step-by-step element and to operate said circuit changing element, said means including mechanism selectively responsive to currents of opposite polarity for selectively setting said step-by-step element.

3. A device of the character described having a winding, two armatures under the control of said winding, a circuit controlling device under the control of one armature, and means under the control of the second armature to machanically control the first aforesaid armature selectively responsive to impulses of opposite polarity, said first aforesaid armature responding to any energization of said winding and said second aforesaid armature responding selectively in accordance with the polarity of the energization of said winding.

4. A device of the character described having a winding, two armatures under the control of said Winding, a circuit controlling device under the control of one armature, and an escapeinent mechanism under the control of the second armature to mechanically control the first aforesaid armature,

said first aforesaid armature responding to any energization of said Winding and said second aforesaid armature responding selectively in accordance with the polarity of the energization of said winding.

5. In a system of the character described having a central station and substations united by a line circuit, a permission element at each substation, step-by-step means to control same, means at the central station for impressing alternating currents on said circuit, an armature for operating said step-by-step element, a switching device to control a signal, an armature controlled by said permission element to control said device, and a winding to control said armatures.

In witness whereof, I hereunto subscribe my name this 26th day of July A. D. !913.

l VILLIAM S. BURNETT.

\Vitnesses:

HENRY VOCKE, J. E. Hnssn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

